Screening-tray for stone washers and separators.



W. LANGE.

SCREENING TRAY FOR STONE WASHBRS AND SEPARATORS.

APPLICATION FILED JULY 31,1913.

Patented Nov. 18, 1918.

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XVILLIAM LANGE, OF TOMKINS COVE, NEW YORK, ASSIG-NOR OF ONE-HALF TO CALVIN TOMKINS, 0F NEl/V YORK, N. Y.

SCREENING-TRAY FOR STONE WASI-1ERE; AND SEPARATORS.

Specification of Letters Patent.

Application filed July 31, 1913.

Patented Nov. 18,1913.

Serial No. 789,243.

To alt 'Lv/rom it may concern:

Be it known that I, VILLIAM LANGE, a citizen of the United States of America, and a resident of Tomkins Cove, in the county of Rockland and State of New York, have invented certain new and useful Improvements in Screening-Trays for Stone `Wash ers and Separators, of which the following is a description.

My invention relates to the screening trays used, in the rotating drums of stone washers and separators, for the purpose of separating larger and smaller particles of stone from sand, mud, dirt, and other impurities, according to the method and with the apparatus shown and described in my prior application for patent tiled i'ipril it, 1913, and serially numbered 758,803, and the object of my invention is to produce screening trays of an improved construction and capable of performing the functions attributed to the screens or trays referred to in the aforesaid application.

In the drawings forming a part of 'the present specilication Figure 1 is a front or face View of a washer drum provided with screening trays in accordance with my present invention. Fig. 2 is an edge View of the same. Fig. 3 is a View of a screening tray and a fragment of the washer drum, the View being taken from within the washer' drum and looking to the right as indicated by the arrow marked 3 in Fig. 1. Fig. 4t is a front View of a screening tray detached from the washer drum, in the direction indicated by the arrow marked L1 in Fig. 3.

In performing its functions of washing and separating, the washer drum is rotated in the direction of the arrow A, in Fig. 1, the screening trays receiving a mixture from a chute extending in the direction of the arrow B and delivering the mixture to the screening trays approximately at the point C. The revolution of the washer' drum carries the mixture on the course indicated by the arrow D, the screening trays, as they change position, losing the fluid and waste material and retaining the screened material, the fine screened material being delivered in the direction of the arrow E and the coarse screened material being delivered in the direction of the arrow F, the screened material being afterward deposited through the front orifice into suitable receptacles not shown, and the waste material passing through the rear orilice all as described in my hereinbefore mentioned application.

10 is the front plate of the washer drum, 11 the peripheral casing of the washer drum. 12 the rear wall of the washer drum, 13 and 111 the front and rear roller guides, 15 the front or screened material orifice and 16 the rear or *aste material orifice, the wall about the front orifice being stilt'ened by an annular band 17 and the wall about the rear orifice being stillened by an annular band 18 carrying an annular flange or lip 19. All of these parts are approximately of the construction shown in my hereinbefore referred to application.

Within the washer' drum a circular series of screening trays 2() is removably or permanently secured, the trays being alike one to the others. Each screening tray is composed of a perforated plate 21 which is stili"- ened by angle irons 22, extending approximately lengthwise of the screening tray, and which is provided with numerous perforations 23 preferably in the form of rows of staggered slots extending transversely of the screening tray, and with a backturned lip 24 along its inner end, and an im perforate plate 25 extending `lengthwise of the screening tray, and spaced Ytroni the perforated plate 21 except along its lower and inner edges, the lower edge of the imperforate plate being bound to the lower edge of the perforated plate and to the brackets 2G by the :lastenings 2T, the brackets 26 being secured to the front plate 10 and the peripheral casing 11 of the washer drum by fastenings 2S and 29 respectively, the upper part of each perl'orated plato 21 being additionally secured in position by brackets 30 and fastenings 31, to the peripheral casing 11. The inner edge of the iinperforate plate is provided with a bacldiurned lip 32 corresponding in shape to the backturned lip 2-1 of the perforated plate 2l, and the backturncd lip 532 seats in or against the rear side of the backturned lip 2-1 makingI a fluid dellecting inner edge to the screening tray.

The perforated plates are preferably bent or curved into a scoop shape for the better' retention of the mixture being screened but this curving a matter of choice and its benefit will vary with the speed and material with which the washer drum is used or employed.

rlhe longitudinal angle irons tend to direct the mixture Vtoward the axis lof the washer drum and prevent a congestion of the screened material on any part of the perforated plate 21 or side shifting of t-he material to the lower edges of the screening trays.

The transverse slots or perforations Q3V pass the fluid portions of the mixture through the screening tray and their transverse arrangement has been found to be preferable, from a practical standpoint, to a longitudinal arrangement, the perforations being also preferably long and narrow, and varying in size with the material to be screened, and staggered or overlapped.

The imperforate plates 25 may be longitudinally or transversely curved but should liare outwardly away from the perforated plates 21 from the lower edge up. rlhe imperforate plates receive the rush of fluid from the perforated plates and prevent it being deposited on succeeding screening trays thus preventing drenching of such suceeding screening trays and permitting them to screen their share of the mixture without interference. The imperforate plate further directs the fluid toward the axis of the washer drum where the fluid can be either of further service in the washing operation or mayy be permitted to escape over the flange or lip 19. The backturned lips E24 and 32 direct the fluid backward at the inner edges of the screening trays thus preventing the fluid from escaping with the screened material through the front oriiice 15.

Having thus described my invention the following is what l claim as new therein and desire to secure by Letters Patent: Y

1. A screening tray constructed with a perforated plate having a back turned lip along its inner end and an imperforate plate extending lengthwise of the perforated plate from its lower and inner edges and spaced from the perforated plate beyond said edges.

2. A screening tray constructed with a plate having transverse perforations and a back turned lip along its inner edge and an imperforate plate extending lengthwise of the perforated plate from its lower and inner edges and spaced from the perforated plate beyond said edges.

3. A screening tray constructed with a plate having transverse staggered perforations and a back turned lip along its inner Copies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patents,

Washington, D. C.

edge and an imperforate plate extending lengthwise of the perforated plate from its lower and inner edges and spaced from the perforated plate beyond said edges.

1l. A screening tray constructed with a Vplate having transverse rows of staggered slots and a back turned lip along its inner edge and an imperforate plate extending lengthwise of theV perforated plate from its lower and inner edges and spaced from the perforated plate beyond said edges.

5. A screening tray constructed `'with a perforated plate having Va4 backturned lip along its inner edge and longitudinal sti'ening` bars, and an imperforate plate extending lengthwise of the perforated plate from its lower and inner edges and spaced 'from the perforated plate beyond said edges.

6. A screening tray constructed with a perforated plate having a back turned lip along its inner end,` and an imperforate plate extending lengthwise'of` the perforated plate from its lower and inner edges, spaced from the perforated plate beyond said edges and having a back turned lip along its inner end.

7.V The combination with a drum, of a screening tray constructed with a perforated plate having a back turned lip along 'its inner end, and an imperforate plate extend` ing lengthwise of the perforated plate from its lower and inner edges, and spaced from the perforated plate beyond said edges and means for securing the tray in non-radial position within the drum.

8. A screening tray constructed with al curved or scoopV shaped perforated'rplate having a back turned lip along its inner end, and an imperforate plate extending lengthwise of the perforated plate from its lower and inner edges, and spaced from the perforated plate beyond said edges. 9. A screening tray constructed with a curved or scoop shaped perforated plate having a back turned lip along its inner end, and an imperforate plate extending lengthwise of the perforated plate from its lower and inner edges, spaced from the perforated plate beyond said edges and Vhaving a back turned lip fitting against the back turned lip of the perforated plate.

W'ILLIAM LANGE.

Witnesses: Y

J. S. TUCKER,

HENRY S. MOORE. 

